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Summary of Significant Accounting Policies - Billable Expenses (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Billable Expenses $ 8.6ctg_BillableExpenses $ 11.8ctg_BillableExpenses $ 13.4ctg_BillableExpenses